Minnesota Vikings running back Adrian Peterson (28) puts on his helmet as he enters the field before the start of their NFL football game against the Green Bay Packers Sunday, Dec. 30, 2012, in Minneapolis. (AP Photo/Genevieve Ross)

Photo: Genevieve Ross, Associated Press

Minnesota Vikings running back Adrian Peterson (28) puts on his...

Image 2 of 2

MINNEAPOLIS, MN - DECEMBER 30: Adrian Peterson #28 of the Minnesota Vikings looks on during a game against the Green Bay Packers on December 30, 2012 at Mall of America Field at the Hubert H. Humphrey Metrodome in Minneapolis, Minnesota. (Photo by Andy Clayton King/Getty Images)